According to the press release: Radiator Springs 500 1/2 tells the story of a “leisurely drive” planned in honor of Radiator Springs’ town founder, Stanley, which turns precarious as Baja pros descend on the town and challenge Lightning McQueen to an off-road race. Meanwhile, the townsfolk, led by a Stanley-costumed Mater, enjoy the planned “leisurely drive” to retrace Stanley’s original frontier route. Thinking they’re on the same course, a wrong turn sends McQueen and the Baja pros on a treacherously wild bid for survival. The misunderstanding leaves the racing professionals in awe of the “legend” of Stanley: the Original Off-Road Racer.